triokorea.blogg.se - Subject of semaphor

#SUBJECT OF SEMAPHOR HOW TO#
#SUBJECT OF SEMAPHOR CODE#

Semaphore(int initialCount, int maximumCount, string name): It initializes a new instance of the Semaphore class, specifying the initial number of entries and the maximum number of concurrent entries, and optionally specifying the name of a system semaphore object.

Semaphore(int initialCount, int maximumCount): It initializes a new instance of the Semaphore class, specifying the initial number of entries and the maximum number of concurrent entries.

The Semaphore Class in C# provides the following four constructors that we can use to create an instance of the Semaphore class.

If you right-click on the Semaphore class and select go to definition, then you will see the following that the Semaphore is a sealed class and it inherited from WaitHandle class. Let us understand the different Constructors, and Methods of Semaphore Class in C#. Constructors, and Methods of Semaphore Class in C#: So, in real-time, we need to use Semaphore when we have a limited number of resources and we want to limit the number of threads that can use it. In other words, we can say that Semaphore allows one or more threads to enter into the critical section and execute the task concurrently with thread safety. The Semaphore in C# is used to limit the number of threads that can have access to a shared resource concurrently. Let us proceed further and understand the C# Semaphore Class in detail. Now, I hope you understand the basic need for the Semaphore in C#. The first two times, you will see the message that External Thread Acquired, but when you run for the 3rd time you will see the message External Thread Trying to Acquiring only as shown in the below image. Now, the build the project and then run the application EXE file three times. This section can be access by maximum three external threads: End This section can be access by maximum three external threads: StartĬonsole.WriteLine("External Thread Acquired") Semaphore = new Semaphore(2, 2, "SemaphoreDemo") Ĭonsole.WriteLine("External Thread Trying to Acquiring")

#SUBJECT OF SEMAPHOR CODE#

Here Maximum 2 external threads can access the code at the same time If Semaphore not Exists, create a semaphore instance Semaphore = Semaphore.OpenExisting("SemaphoreDemo") Try to Open the Semaphore if Exists, if not throw an exception Public static Semaphore semaphore = null the code in between the WaitOne method and Release method. In the below example we are creating the semaphore instance to allow a maximum of two threads to access our application code i.e.

#SUBJECT OF SEMAPHOR HOW TO#

Let us first see an example of how to restrict the number of external threads to access our application code using Semaphore and then we will understand the Semaphore Class in detail. For a better understanding, please have a look at the below image.

But, if we want more control over the number of external threads that can access our application code, then we need to use Semaphore in C#. Using Mutex, only one external thread can access our application code at any given point in time and this we have already seen in our previous article.

On the other hand, Mutex ensures thread safety for threads that are generated by the external applications i.e. The Lock and Monitors are basically used to provide thread safety for threads that are generated by the application itself i.e. Like Lock, Monitor, and Mutex the Semaphore is also used to provide thread-safety. Why do we need Semaphore as we already have Lock, Monitor, and Mutex in C#?

Understanding the different methods of Semaphore class with examples.Why do we need Semaphore as we already have Lock, Monitor, and Mutex in C#?.ConcurrentDictionary Collection Class in C#.Generic LinkedList Collection Class in C#.Generic SortedDictionary Collection Class in C#.Generic SortedSet Collection Class in C#.Generic SortedList Collection Class in C#.Conversion Between Array List and Dictionary in C#.Generic Dictionary Collection Class in C#.How to Sort a List of Complex Type in C#.Advantages and Disadvantages of Non-Generic Collection in C#.Advantages and Disadvantages of Arrays in C#.Data Structures and Algorithms Tutorials.